Threaded barb fitting



FIG. 1 is a side elevational view of a threaded barb fitting showing my new design;

FIG. 2 is an end elevational view in the direction of arrow A on FIG. 1 thereof;

FIG. 3 is an end perspective view thereof; and

FIG. 4 is another end perspective view thereof. 

The ornamental design for a threaded barb fitting, as shown and described. 